[Genetic polymorphism of the myogens of the lake frog (Rana ridibunda Pall.)].

348 individuals of Rana ridibunda Pall. collected in 3 points of the area (Moscow, Kiev, Astrakhan regions) have been studied by means of electrophoresis muscle proteins in polyacrylamide gel. Three variants of fractions have been found in different specimen on one part of the electrophoretic spectrum. These variants are considered as phenotypes of two-allelic codominant system of one locus inheritance that is confirmed by the correspondence of observational and expected number of phenotypes according the Hardy-Vainberg law. The found polymorphism independence of sex has been proved. The frequency of quick alleles fluctuates from 0,361 to 0,867. Similarity and difference according allele A frequency have been shown. The polymorphic system may serve as a genetic marker for the investigation of population structure of lake frog.